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Ten Turn Pot Forms Frequency Readout


This hobby circuit gates the output of a continuously operating 32KHz crystal oscillator to the input of a C-MOS buffer when clock pulses are needed. The technique gets around the problem of a slow starting crystal oscillator by keeping the oscillator going and switching on a transistor power stage only as needed.
The method keeps the standby power consumption to a very low 1uA when used with a 3v supply.
Letís say you are designing a signal generator for a test fixture. To adjust the frequency you would like to use a ten turn pot with a nice dial mechanism attached as a frequency display. However, a display range of 0 to 9.99 would be impractical since there is no such frequency as 0. But since many pot dials have a display of "11" at the highest setting you could shift the display for a range of 1 to 11 and get a nice linear function. The signal generator circuit could then be setup in nice decade steps with a range selection switch and get an overall accuracy of about 1/2%.

 

Click on Drawing Below to view PDF version of Schematic

Circuit Circuit Ten Turn Pot Forms Frequency Readout

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